﻿// ------------------------------------------------------------------------
//  Copyright 2025 The Dapr Authors
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//      http://www.apache.org/licenses/LICENSE-2.0
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//  ------------------------------------------------------------------------

using System.Runtime.InteropServices;

namespace Dapr.Cryptography.Extensions;

internal static class ReadOnlyMemoryExtensions
{
    public static MemoryStream CreateMemoryStream(this ReadOnlyMemory<byte> memory, bool isReadOnly)
    {
        if (memory.IsEmpty)
        {
            return new MemoryStream([], !isReadOnly);
        }

        if (MemoryMarshal.TryGetArray(memory, out ArraySegment<byte> segment) && segment.Array is not null)
        {
            return new MemoryStream(segment.Array, segment.Offset, segment.Count, !isReadOnly);
        }

        throw new ArgumentException("Unable to create MemoryStream from provided memory value", nameof(memory));
    }
}
